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In Morgan's experiments on Drosophila, genes for **yellow body** and **white eye** showed only 1.3% recombination, while **white body** and **miniature wing** showed 37.2%. The correct interpretation is:
AYellow body and white eye are on different chromosomes; white body and miniature wing are on the same one.
BYellow body and white eye are very close on the same chromosome (strongly linked); white body and miniature wing are farther apart (weakly linked) on that chromosome.
CRecombination frequency is unrelated to gene distance.
DHigher recombination means stronger linkage.
Answer & Solution
Correct answer: B. Yellow body and white eye are very close on the same chromosome (strongly linked); white body and miniature wing are farther apart (weakly linked) on that chromosome.
Recombination frequency is proportional to physical distance between linked genes on a chromosome (Morgan's key insight, basis of genetic maps). Low recombination (1.3%) ⇒ genes very close (strongly linked); high recombination (37.2%) ⇒ farther apart (weakly linked). By definition 1% recombination ≈ 1 map unit (centiMorgan).
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